Optimized high-frequency based interpolation for multispectral demosaicking

Multispectral demosaicking, which is an extension of color demosaicking, is a challenging problem because each band is significantly undersampled and thus precise reconstruction is needed for the restoration of high-frequency components, such as edges, textures etc. In general, existing algorithms borrow high-frequency information either from different bands via inter-color correlation or from within the bands, and produces artifact in the reconstructed image. To meet this inherent shortcoming, we propose to incorporate two different high-frequency components and integrate them optimally in the linear minimum mean square sense (LMMSE) for the precise reconstruction of undersampled components. Experimental results demonstrate that the proposed algorithm based on the optimized high-frequency achieves superior performance compared to existing algorithms both in terms of objective and subjective quality.